_ .. / ... / skin(s) / obstacle(s) / place(s) / failure(s) / culture(s) / _ / .

twinkle(s) / difference(s)

experiment knowledge illusion scratch engine craft maze run ar x

methods / guide(s) / student(s) / parent(s) / teacher(s)

... / play / game(s) / rule(s) / teaching(s) / visual(s) / project(s) / cycle(s)